Locking the iphone 4 from using mobile network?

Is there a way to block the iphone 4 from using the carriers mobile network, I'd rather just use Wi-Fi hotspots to avoid any over usage of the plans network. I have read that the phone randomly access's the network for certain aps, so I'm wondering is there a way to prevent it from accessing the network, and I'd prefer not to jail break the phone. Any suggestions are highly appreciated!

Settings
General
Network
Cellular Data - switch to off

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